using System;
using System.Security.Cryptography;
/*
 * $Id: ImgJBIG2.java 3962 2009-06-10 11:43:19Z psoares33 $
 *
 * Copyright 2009 by Nigel Kerr.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999-2009 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000-2009 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

namespace iTextSharp.text {

    /**
    * Support for JBIG2 images.
    * @since 2.1.5
    */
    public class ImgJBIG2 : Image {
        
        /** JBIG2 globals */
        private byte[] global;
        /** A unique hash */
        private byte[] globalHash;
        
        /**
        * Copy contstructor.
        * @param    image another Image
        */
        ImgJBIG2(Image image) : base(image) {
        }

        /**
        * Empty constructor.
        */
        public ImgJBIG2() : base((Image) null) {
        }

        /**
        * Actual constructor for ImgJBIG2 images.
        * @param    width   the width of the image
        * @param    height  the height of the image
        * @param    data    the raw image data
        * @param    globals JBIG2 globals
        */
        public ImgJBIG2(int width, int height, byte[] data, byte[] globals) : base((Uri)null) {
            type = Element.JBIG2;
            originalType = ORIGINAL_JBIG2;
            scaledHeight = height;
            this.Top = scaledHeight;
            scaledWidth = width;
            this.Right = scaledWidth;
            bpc = 1;
            colorspace = 1;
            rawData = data;
            plainWidth = this.Width;
            plainHeight = this.Height;
            if ( globals != null ) {
                this.global = globals;
                try {
                    MD5 md5 = new MD5CryptoServiceProvider();
                    md5.Initialize();
                    this.globalHash = md5.ComputeHash(this.global);
                } catch {
                    //ignore
                }
            }
        }
        
        /**
        * Getter for the JBIG2 global data.
        * @return   an array of bytes
        */
        public byte[] GlobalBytes {
            get {
                return this.global;
            }
        }
        
        /**
        * Getter for the unique hash.
        * @return   an array of bytes
        */
        public byte[] GlobalHash {
            get {
                return this.globalHash;
            }
        }
    }
}